package com.itheima.sh.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

//全局过滤器，实现登录拦截功能
@Order(0)//等同下面getOrder
@Component
public class LoginFilter implements GlobalFilter {//, Ordered

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //  1.exchange获取req,res
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
       //2.获取参数token
        String token = request.getQueryParams().getFirst("token");
        //2.1没有获取到token,拦截
        if (token==null){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);//返回401状态码
            return response.setComplete();
        }
        //2.2判断不是token-admin，拦截
        if (!"admin".equals(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //3放行
        return chain.filter(exchange);
    }

//    @Override
//    public int getOrder() {
//        return 0;//值越小越优先执行
//    }
}
